<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      class Person {
        age = 20;
        gender = "boy";
        constructor(age) {
          this.name = "jack";
        }
      }
      const p1 = new Person();
      console.log(p1);
    </script>
  </body>
</html>
